Grip-tread for pneumatic tires.



B. H. SILLS.

em TREAD r01; rnumm TIRES.

- APPLIOLTIO! FILED 1730.14, 1907.

A Patented 0ct.20,1908.-

BERTON HERBERT SILLS, OF OTTAWA. ONTARIO, CANADA.

GRIP-TREAD FOR PNEUMATIC TIRES.

Specification of Letters Patent.

Patented Oct. 20, 1908.

Application filed December 1!, 1907. Serial No. 406.580.

To all :w/mm it ma concern: Be it known t at- I, Bun'ros llnnnun'i Sum, of Ottawa, in the county of Carleton,

Province of Ontario, Canada. have invented able and held in position in such a msnncr that they are. free to roll about their own axes and thus equalize the'wcnr on all sides.

, In its construction the invention includes a plurality of transverse gripping members.

which extend on. each side through flexible. annular connecting members and springs extending between the transverse gripping members and the annular members, all us hereinafter more fully set forth and described in the accompanying specifications and drnw- $1 the drawings, Figure 1 is a side view of a wheel and'tire equipped with my improved grip tread. sectional detnil of the same. spective detail of one of the transverse gripping mcmbers. Fi 4 is a side view of u tensioning device whii-h may be applictLto the annular member. view showing an alternative form of annular member.

In the drawings, like letters of reference indicate corresponding parts 111 each figure.

Referring to the drawings, A represents a tire of any suitable construction and a is a ilurahty of transverse flexible gripping mem- )ers, preferably and usually, m the form of chains. These members are connected on each side of the wheel to flexible, annular members B, the character of the connection being such that the transverse members may be free to roll about their own axes and will be held resiliently against the tires.

The transverse members are connected to the annular member through the medium of Fi 2 is an cnlar cd transverse b n v l ng. .5 is a perr Fig. 5 is a perspective bolts 1) having eyelet-heads e engaged by hooks d on the gripping members and compression s )rings c extending between the inner side oi the annular member and the head f of the bolt' The eyelet head c is preferably separated from the bolt. nnd has a screw- 1 threaded engagement therewith, as illustrated in Fig. 2, whereby the tension of the spring may be adjusted if desired. I

To take. up any ninth in the annular member or to reduce the length thereof, when there is occasion to remove any of the gripping members, as for instance, when the grip trend is to be used on light dry roads, a tightening device L is provided. This consists of two claw members 3/ and Il, having books i -und j adapted to engage thelinks of the chain, a screw member Ir having right and left-hand screws and m on opposite. sides thereof, which extend through and engage the claw members, and n thumb screw n for turning the ame. By this means the two c-low members; and consequently the ends of the chain may be. drawn closer together or I separated as desired.

in the alternative form shown in Fig. 5,

- the annular member is in the form of two twircs o and p, which have transverse U- slutped brackets q sliduble thereon, in which the bolts 1) are supported.

it will be observed that the bolts may freely turn on their axes in the annular memher and consequently;each transverse mcmi ber may roll about its axis. and thus equalize the wcur on nli sides. Further than this, tit.- bolts may be very rapidly removed mid thus the number of transverse nuunbers chnngt l and arranged to suitthe character of the road. 1

When it is desired to remove the grip trend, the transverse membcis may be very i quickly unhookcd from their respect ive bolts and the whole grip tread packed in a very small space.

- Erich transverse gripping member being 4 held independently with a resilient pressure In the f referred embodiment, this is accomplished y making the annular members in the form particular, the ordinary form of bicycle chain, 1 have found may he against the tire. the whole tread will be noiseless in its 0 ration, which, as well as adding to the eomilirt of the user, will decrease the amount of wear on the transverse members.

While the invention has been described herein, with great particularity of detail. yet i it will be readily understood that in carrying out the construction of the same. changes,

' i i as eeP-r 7 within the 500 of the ap ended'cle-ims, may mss across the Lrmul of the wheel, said flexibe made, wit out (lepertmg from the spirit, of the invention.

Whs.t I-ela1m as my LHFQDUOH -1s:--

" transrerse chains lo'pass the wheel, annular chums wheels compris' across the treed ci? vl0 members having their cxtrmni't-ics connec'neu to saul annulmniembers with freerlmn both to move outwardly and inwardly i -1.' An anti slipping device for v'ehicle 1o transverse chains extemling t-brquqh the annular chains, androtatable with respect dinal axes as they creep urnunllllw pvri iliery 'u-of the wheel. 2. An anti slipping device for vehicle 7 wheels, comprising a flexible member-tn pass r acrossfihe trend of the wheel, mills mnnircimi I to the extreniiies of the semie, nnrl nn-zms 20 disconnected from the wheel for suppm'iing the bolts-With freeilmn buih to more lungitudinally and relate abnnz their iungiimlinnl axes, Whereb the belts and ilexible members ma roll as t ey creep smuml the pmziphvr v 25 oft ewheel.

3. An anti 1 slipping device for vehicle wheels comprising annular numbers on vm'b sideof the wheelbutiliscezmeetmltherul'rmn,

and tl ensverse flexible members adapted in thereto, whereby the lxiiis and transverse chains are free to rotate about their lnngnuand rotate bodily :rbuut ihvir lnngituilinnl axes, whereby the said flexible mmnbvrs may roll as thei creep nruuml the periphery of the wheel, unil means for exerting un independem inward resilient pull on tlu' extremities uf each flexible member.

4. A rum. slipping device fur vehicle.

means for juurnaling the bolts, whereby lho said bulls and flexible members may rnll Illl nbunt their lungitrulinul axes. as tin-y x-ruu r' about llw pvripl m v of lhe whorl, and springsextending/flirtwhen lhv bulls and the annular inward rvsilicm. pull on eurh hub.

B GR'ION HERBERT HILLS.

Wit nvsses: I r

lli ssm. 5. SMART, Lima bros. 

